我正在为我的第一个 django 站点使用以下模型。但我目前在如何访问用户的意愿方面遇到问题。
class Group(models.Model):
title = models.CharField(max_length=100)
users = models.ManyToManyField(User, related_name='group_users')
description = models.TextField()
added = models.DateTimeField()
owner = models.ForeignKey(User)
def __unicode__(self):
return self.title
class Wish(models.Model):
name = models.CharField(max_length=50)
user = models.ForeignKey(User, related_name='wish_user')
bought = models.IntegerField(default=0)
bought_by = models.ForeignKey(User, related_name='wish_buyer')
added_by = models.ForeignKey(User, related_name='wish_adder')
cost = models.FloatField()
added = models.DateTimeField()
def __unicode__(self):
return self.name
def is_bought(self):
return self.bought % 2 == 1
def is_editable(self):
return self.added >= timezone.now() - datetime.timedelta(hours=1)
当我转到 django shell 时，我得到以下信息：
$ ./manage.py shell
>>> from django.contrib.auth.models import User
>>> from wish.models import Wish, Group
>>> user1 = User.objects.filter(id=1)[0]
>>> user1.group_set.all()
[]
>>> user1.wish_set.all()
Traceback (most recent call last):
File "<console>", line 1, in <module>
AttributeError: 'User' object has no attribute 'wish_set'
>>>
为什么 User 对象没有像得到 group_set 那样得到 wish_set ？